Java - 백준 코딩테스트 2438번 [for문 - 별 찍기 - 1]

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.IOException;
import java.io.InputStreamReader;
import java.io.OutputStreamWriter;
import java.util.StringTokenizer;
 
public class StarStamp {
 
    public static void main(String[] args) throws IOException {
        // 20210617 - 2438번
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(System.out));
        
        int num = Integer.parseInt(br.readLine());
        
        for (int i = 1; i <= num; i++) {
            for (int j = 0; j < i; j++) {
                bw.write(String.valueOf("*"));
            }
            bw.newLine();
        }
        
        bw.flush();
        br.close();
        bw.close();
    }
}